CN104917478A - Filter module based on sensor signal - Google Patents
Filter module based on sensor signal Download PDFInfo
- Publication number
- CN104917478A CN104917478A CN201510246448.6A CN201510246448A CN104917478A CN 104917478 A CN104917478 A CN 104917478A CN 201510246448 A CN201510246448 A CN 201510246448A CN 104917478 A CN104917478 A CN 104917478A
- Authority
- CN
- China
- Prior art keywords
- filtration module
- interface
- sensor signal
- output
- filter module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
Abstract
The invention provides a filter module based on a sensor signal, and relates to the field of filter circuits. The technical problem that the existing sensor signal filter module has the disadvantages of large gain attenuation, poor filtering effect and the like, and is susceptible to the interference of power supply end noise or other high frequency signals. According to the invention, the device is structurally characterized in that the device comprises a power supply VDD and a first filter module which is connected with the power supply VDD; the first filter module is provided with a first interface which is connected with a sensor; the device further comprises a second filter module; and the second filter module is provided with a second interface which is connected with the sensor and an output end OUTPUT. The filter module provided by the invention is used for signal filtering.
Description
Technical field
The present invention relates to filter circuit field, be specifically related to a kind of filtration module based on sensor signal.
Background technology
The filtration module of existing sensor signal is made up of the electric capacity of low order RC low pass filter or cascade, and source does not have filter unit.When external circuit has a load, signal will be decayed; Such as, single order RC low pass filter, frequency response is H(s)=1/ (1+RCS), R=20K Ω, RL=5K Ω, will decay 80% to the direct current signal passed through.If when transducer is high quick signal transducer, useful signal is more weak, now source does not have filter unit, enters the noise of transducer or other high-frequency interferencing signals will export transducer and have an impact with source.Secondly, the electric capacity of low order RC low pass filter or cascade to noise or other high-frequency interferencing signal filter effects undesirable, signal passband poor linearity, larger in the gain reduction of cut-off frequency place.
Summary of the invention
For above-mentioned prior art, the object of the invention is to provide a kind of filtration module based on sensor signal, its filtration module gain reduction being intended to solve existing sensor signal is comparatively large, is vulnerable to source noise or the interference of other high-frequency signals, and the technical problem such as filter effect is undesirable.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of filtration module based on sensor signal, comprise power vd D, the first filtration module be connected with power vd D, first filtration module is provided with the first interface for connecting sensor, also comprise the second filtration module, the second filtration module is provided with the second interface and the output OUTPUT of connecting sensor.
In such scheme, the first described filtration module, comprise Single port three rank Bert watt hereby low-pass filter circuit, its input interface is connected with power vd D and output interface is connected with sensor interface A.Described Single port three rank Bert watt hereby low-pass filter circuit, comprises first order second order filter and the second level firstorder filter of cascade.Leach the signal disturbing that power vd D brings, the useful weak signal of protection transducer, eliminates the impact on sensor output signal.
In such scheme, the second described filtration module, comprise Single port quadravalence Bert watt hereby low-pass filter circuit, its input interface is connected with sensor interface B and output interface is connected with output OUTPUT.Described Single port quadravalence Bert watt hereby low-pass filter circuit, comprises first order second order filter and the second level second order filter of cascade.Owing to having high input impedance and extremely low output impedance, direct cascade does not need impedance matching, reduces original paper; Hardly gain reduction is produced to direct current signal or low frequency signal; Bert watt hereby low pass filter has maximum flatness or the linearity in signal passband, and exponent number is higher, and the linearity is better, has stronger inhibitory action to high-frequency noise;-3dB is had to decay at cut-off frequency place.
In such scheme, the first order second order filter of described cascade and second level second order filter, comprise positive pole and be connected to the amplifier that RC low pass loop and negative pole are connected to C, R feedback loop of series connection.Described second level firstorder filter, comprises positive pole and is connected to the amplifier that RC low pass loop and negative pole are connected to load resistance.Filtered signal produces gain, causes output signal to have larger energy.
Accompanying drawing explanation
Fig. 1 is transducer filtration module of the present invention;
Fig. 2 is the Single port three rank Bert watt hereby low-pass filter circuit of transducer filtration module of the present invention;
Fig. 3 is the Single port quadravalence Bert watt hereby low-pass filter circuit of transducer filtration module of the present invention;
Fig. 4 is the existing filtration module of transducer filtration module of the present invention;
Fig. 5 is transducer filtration module practical application of the present invention example;
Bert watt hereby low-pass filter circuit in 1-Single port three rank in figure, 2-transducer, 3-PCB, 4-Single port quadravalence Bert watt hereby low-pass filter circuit.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Below in conjunction with accompanying drawing, the present invention will be further described:
Fig. 1 is transducer filtration module of the present invention, comprise power vd D, the first filtration module 1 be connected with power vd D, first filtration module 1 is provided with the first interface for connecting sensor 2, also comprise the second interface and output OUTPUT that the second filtration module 4, second filtration module 4 is provided with connecting sensor 2.
Fig. 2 and Fig. 3 is the Single port quadravalence Bert watt hereby low-pass filter circuit of Single port three rank Bert watt hereby low-pass filter circuit and the transducer filtration module of the present invention of transducer filtration module of the present invention respectively, the second described filtration module 4, comprise Single port quadravalence Bert watt hereby low-pass filter circuit, its input interface is connected with transducer 2 interface B and output interface is connected with output OUTPUT.Described Single port quadravalence Bert watt hereby low-pass filter circuit, comprises first order second order filter and the second level second order filter of cascade.The first order second order filter of described cascade and second level second order filter, comprise positive pole and be connected to the amplifier that RC low pass loop and negative pole are connected to C, R feedback loop of series connection.Described second level firstorder filter, comprises positive pole and is connected to the amplifier that RC low pass loop and negative pole are connected to load resistance.
Fig. 4 is the existing filtration module of transducer filtration module of the present invention, only has two cascade electric capacity at sensor output, and gain reduction is comparatively large, be vulnerable to source noise or the interference of other high-frequency signals, and filter effect is undesirable.
Embodiment 1
Fig. 5 is transducer filtration module practical application of the present invention example, transducer is that ccd image sensor TCD1501D takes in picture signal, after transducer filtration module of the present invention leaches high-frequency noise, output OUTPUT meets A/D converter AD9826, digital signal after conversion is imported in FPGA, transmit front end signal to computer by USB transmission control unit (TCU) after FPGA processing signals, realize high-definition image display.
Beneficial effect of the present invention: leach the signal disturbing that power vd D brings, the useful weak signal of protection transducer, eliminates the impact on sensor output signal; Owing to having high input impedance and extremely low output impedance, direct cascade does not need impedance matching, reduces element; Hardly gain reduction is produced to direct current signal or low frequency signal; Bert watt hereby low pass filter has maximum flatness or the linearity in signal passband, and exponent number is higher, and the linearity is better, has stronger inhibitory action to high-frequency noise;-3dB is had to decay at cut-off frequency place; Filtered signal produces gain, causes output signal to have larger energy.Passband signal gain reduction is little, eliminate source noise or the interference of other high-frequency signals, and filter effect is more satisfactory.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly belongs to those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (7)
1. the filtration module based on sensor signal, it is characterized in that, comprise power vd D, the first filtration module (1) be connected with power vd D, first filtration module (1) is provided with the first interface for connecting sensor (2), also comprise the second filtration module (4), the second filtration module (4) is provided with the second interface and the output OUTPUT of connecting sensor (2).
2. the filtration module based on sensor signal according to claim 1, it is characterized in that, described the first filtration module (1), comprise Single port three rank Bert watt hereby low-pass filter circuit, its input interface is connected with power vd D and output interface is connected with transducer (2) interface A.
3. the filtration module based on sensor signal according to claim 2, is characterized in that, described Single port three rank Bert watt hereby low-pass filter circuit, comprises first order second order filter and the second level firstorder filter of cascade.
4. the filtration module based on sensor signal according to claim 1, it is characterized in that, described the second filtration module (4), comprise Single port quadravalence Bert watt hereby low-pass filter circuit, its input interface is connected with transducer (2) interface B and output interface is connected with output OUTPUT.
5. the filtration module based on sensor signal according to claim 4, is characterized in that, described Single port quadravalence Bert watt hereby low-pass filter circuit, comprises first order second order filter and the second level second order filter of cascade.
6. the filtration module based on sensor signal according to claim 5, it is characterized in that, the first order second order filter of described cascade and second level second order filter, comprise positive pole and be connected to the amplifier that RC low pass loop and negative pole are connected to C, R feedback loop of series connection.
7. the filtration module based on sensor signal according to claim 3, is characterized in that, described second level firstorder filter, comprises positive pole and is connected to the amplifier that RC low pass loop and negative pole are connected to load resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510246448.6A CN104917478A (en) | 2015-05-15 | 2015-05-15 | Filter module based on sensor signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510246448.6A CN104917478A (en) | 2015-05-15 | 2015-05-15 | Filter module based on sensor signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104917478A true CN104917478A (en) | 2015-09-16 |
Family
ID=54086245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510246448.6A Pending CN104917478A (en) | 2015-05-15 | 2015-05-15 | Filter module based on sensor signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104917478A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107636438A (en) * | 2016-11-04 | 2018-01-26 | 歌尔股份有限公司 | Signal processing apparatus, air pressure sensing device assembly and electronic equipment |
| CN112217514A (en) * | 2019-07-11 | 2021-01-12 | 格科微电子（上海）有限公司 | Implementation method for reducing offset error of image sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2596340Y (en) * | 2002-11-19 | 2003-12-31 | 西安交通大学 | Infrared temperature detection sensor based on soft ware compensation |
| CN202582780U (en) * | 2012-03-13 | 2012-12-05 | 王兵 | Fluorescent fiber temperature measurer |
| CN203100905U (en) * | 2013-02-05 | 2013-07-31 | 天广消防股份有限公司 | Signal processing circuit of flame detector |
| CN204906330U (en) * | 2015-05-15 | 2015-12-23 | 成都众孚理想科技有限公司 | Filter module based on sensor signal |
-
2015
- 2015-05-15 CN CN201510246448.6A patent/CN104917478A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2596340Y (en) * | 2002-11-19 | 2003-12-31 | 西安交通大学 | Infrared temperature detection sensor based on soft ware compensation |
| CN202582780U (en) * | 2012-03-13 | 2012-12-05 | 王兵 | Fluorescent fiber temperature measurer |
| CN203100905U (en) * | 2013-02-05 | 2013-07-31 | 天广消防股份有限公司 | Signal processing circuit of flame detector |
| CN204906330U (en) * | 2015-05-15 | 2015-12-23 | 成都众孚理想科技有限公司 | Filter module based on sensor signal |
Non-Patent Citations (1)
| Title |
|---|
| 储开斌 等: "《模拟电路及其应用(第2版)》", 28 February 2013, 清华大学出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107636438A (en) * | 2016-11-04 | 2018-01-26 | 歌尔股份有限公司 | Signal processing apparatus, air pressure sensing device assembly and electronic equipment |
| WO2018082051A1 (en) * | 2016-11-04 | 2018-05-11 | Goertek.Inc | Signal processing device, air pressure sensor assembly and electronics apparatus |
| CN107636438B (en) * | 2016-11-04 | 2020-04-17 | 歌尔股份有限公司 | Signal processing device, air pressure sensor assembly and electronic equipment |
| CN112217514A (en) * | 2019-07-11 | 2021-01-12 | 格科微电子（上海）有限公司 | Implementation method for reducing offset error of image sensor |
| CN112217514B (en) * | 2019-07-11 | 2024-02-27 | 格科微电子（上海）有限公司 | Implementation method for reducing offset error of image sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204090123U (en) | Audio output control circuit and audio-frequence player device | |
| CN108259069B (en) | Data transmission system | |
| CN104917478A (en) | Filter module based on sensor signal | |
| CN204906330U (en) | Filter module based on sensor signal | |
| CN205900092U (en) | Echo elimination circuit | |
| CN108336998A (en) | Analog-digital commutator and D conversion method | |
| CN204539097U (en) | A kind of noise reduction filtering circuit for pi type filter and a kind of pi type filter | |
| CN103312348B (en) | Reduce the infrared signal processing circuit of interference | |
| CN204206429U (en) | Audio signal processing | |
| CN203563026U (en) | Low-pass buffer filter circuit | |
| CN203120015U (en) | Video signal amplification circuit | |
| CN105978540B (en) | A kind of postemphasis processing circuit and its method of continuous time signal | |
| CN104811181A (en) | Current-to-voltage conversion circuit with input bias and active power filtering effects and current-to-voltage conversion method | |
| CN210183436U (en) | HDMI audio separator | |
| US20130241638A1 (en) | Signal amplifier circuit for usb port | |
| CN204929209U (en) | Microphone monomer that restraines resonance | |
| CN203563186U (en) | Noise reduction circuit and voice audio driving circuit provided with same | |
| CN102832893B (en) | D-type power amplifier | |
| CN204334734U (en) | Unidirectional magnifier circuit | |
| CN204928972U (en) | Contains video signal amplifier circuit's integrated filter module in advance | |
| CN101964936A (en) | Processing chip for digital microphone, input circuit thereof and digital microphone | |
| CN204392209U (en) | A kind of synchronous sampling signal pre-process circuit | |
| CN104601134A (en) | Signal branching circuit and device | |
| CN105472275A (en) | Signal separation circuit and front-end circuit | |
| CN209845138U (en) | Analog video lossless transmission sending and receiving interface circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150916 |
|
| RJ01 | Rejection of invention patent application after publication |